US10419135B2 - Over the air power sensor and method - Google Patents
Over the air power sensor and method Download PDFInfo
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- US10419135B2 US10419135B2 US15/468,238 US201715468238A US10419135B2 US 10419135 B2 US10419135 B2 US 10419135B2 US 201715468238 A US201715468238 A US 201715468238A US 10419135 B2 US10419135 B2 US 10419135B2
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- polarization
- power sensor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
- H04B17/102—Power radiated at antenna
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/01—Arrangements for measuring electric power or power factor in circuits having distributed constants
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0878—Sensors; antennas; probes; detectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
- H01Q13/085—Slot-line radiating ends
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
- H01Q13/106—Microstrip slot antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
- H01Q25/001—Crossed polarisation dual antennas
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/10—Arrangements for measuring electric power or power factor by using square-law characteristics of circuit elements, e.g. diodes, to measure power absorbed by loads of known impedance
- G01R21/12—Arrangements for measuring electric power or power factor by using square-law characteristics of circuit elements, e.g. diodes, to measure power absorbed by loads of known impedance in circuits having distributed constants
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
Definitions
- the invention relates to an over the air, OTA, power sensor and a corresponding method for measuring power of a wireless signal with at least two different polarizations.
- the present invention solves this need with the over the air, OTA, power sensor with the features of claim 1 and a method with the features of claim 13 .
- a corresponding over the air, OTA, power sensor for measuring power of a wireless signal with at least two different polarizations comprises a first power sensor for every polarization, every power sensor comprising a signal detector for detecting the wireless signal.
- the signal detectors are single polarized and the polarization planes of the signal detectors are arranged at an angle of more than zero degree to each other and the main radiation vectors, i.e. the vectors which represent the main radiation/reception direction, of the signal detectors are parallel to each other.
- the first power sensors each comprise a power measurement device, which is configured to measure the power of the detected wireless signal and output a respective measurement signal.
- measuring power of a wireless signal with at least two different polarizations comprises detecting the wireless signal with one single signal detector in a respective first power sensor for every polarization, wherein the polarization planes of the signal detectors are arranged at an angle of more than zero degree to each other and wherein the main radiation vectors of the signal detectors are parallel to each other.
- the method further comprises measuring the power of the detected wireless signal with one power measurement device in every first power sensor, and outputting respective measurement signals.
- the present patent application is based on the finding that measuring high frequency signals contact-based is not an option, because the device under test will be influenced by the cabling.
- the present invention provides two power sensors, which each detect the wireless signal in one of at least two different polarizations and measure the power levels of the wireless signal in the respective polarization.
- the power measurement devices are provided as diode based power measurement devices.
- the diode based power measurement devices can e.g. comprise a simple arrangement of a diode in forward direction and a capacitor between the cathode and ground, which together form a rectifier and together transform the wireless signal into a measurement voltage.
- the power measurement devices can further comprise amplifier, analogue to digital converters, signal processors for power calculation and the like.
- the power sensors can each comprise a mixer, which is configured to down-convert the received wireless signal to respective frequency reduced measured signals, wherein the power measurement devices are configured to measure the power of the respective frequency reduced measured signal.
- the down-mixing or down-converting of the received wireless signal provides signals with a reduced frequency, which are much easier to analyze than the original high frequency signals.
- the mixer can e.g. be configured to down-mix or down-convert a received 802.11ad wireless signal from the GHz range to an intermediate frequency, IF, range in the kHz range.
- the signal detectors can comprise planar antennas, and the polarization planes of each of the planar antennas can correspond to the plane of the respective polarization.
- Such antennas can e.g. be so called Vivaldi antennas.
- Vivaldi antennas provide very little reflections in the direction of their main radiation vectors.
- Vivaldi antennas have broadband characteristics and are therefore suitable for ultra-wideband signals. They are further easy to manufacture using common methods for PCB production. Further, they can easily be impedance matched to the feeding line using microstrip line modelling methods.
- At least some surfaces, advantageously all surfaces of the power sensors facing in the main radiation direction, i.e. to the device under test, of the signal detectors can be adapted to absorb electromagnetic radiation and do not reflect electromagnetic radiation. Thereby, reflections towards the device under test are prevented. This increases the measuring accuracy.
- At least some surfaces, advantageously all surfaces of the power sensors facing in the main radiation direction of the signal detectors can be coated with a paint absorbing electromagnetic radiation and/or covered with absorber material absorbing electromagnetic radiation and/or fabricated from absorber material absorbing electromagnetic radiation. It is thereby possible to further reduce reflections towards the device under test thereby increasing the measuring accuracy.
- At least some surfaces, 50% of the surfaces, especially more than 70% or more than 90% of the surfaces, especially all surfaces, of the power sensors facing in the main radiation direction of the signal detectors are angled away from the main radiation vectors by at least 30°, preferably by at least 45°, most preferably by at least 60°. This further helps to reduce reflections towards the device under test, further increasing measuring accuracy.
- At least some surfaces, advantageously all surfaces of the power sensors facing in the main radiation direction of the signal detectors can be tapered towards the main radiation direction of the signal detectors. This reduces reflections towards the device under test, thereby increasing measuring accuracy. Further, this provides a small footprint of the OTA power sensor. This increases the flexibility of use.
- the OTA power sensor can comprise one first power sensor for a first polarization and one first power sensor for a second polarization, which is orthogonal to the first polarization, wherein the polarization planes of the first power sensors are each parallel to the respective polarization.
- orthogonally polarized signals can be easily analyzed by providing the polarization planes of the sensors orthogonal to each other.
- the first power sensor for the first polarization and the first power sensor for the second polarization can be interlaced with each other such that they comprise the same main radiation vector.
- Vivaldi antennas can be interlaced such that their respective main radiation vectors overlap each other and point in the same direction. This mechanical arrangement provides a very compact OTA power sensor.
- the OTA power sensor can comprise at least a second power sensor, which especially can be of the same type as the first power sensors, for the first polarization.
- the polarization plane of the signal detector of the second power sensor for the first polarization can be arranged in parallel to the first polarization, and the main radiation vectors of the first power sensor and the second power sensor for the first polarization can be parallel to each other.
- the sensors for the first polarization are therefore oriented in parallel in the same direction. This arrangement allows monitoring the power levels of the wireless signal at the borders of a measurement space, which is defined by the two sensors. Values of the power levels between the two power sensors can then easily be calculated.
- the first power sensor for the second polarization can be positioned between the first power sensor and the second power sensor for the first polarization.
- the polarization plane of the first power sensor for the second polarization can be parallel to, and especially can lay in, the plane defined by the main radiation vectors of the first power sensor and the second power sensor for the first polarization.
- the main radiation vectors of the first power sensor and the second power sensor for the first polarization and the first power sensor for the second polarization can be parallel to each other. This means that all power sensors point in the same direction, i.e. their main radiation vectors point in the same direction.
- the power sensors for the first polarization can e.g. be placed one on each side of the power sensor for the second polarization. This configuration can e.g. be called H-configuration.
- the OTA power sensor can comprise at least a second power sensor, which especially can be of the same type as the first power sensor, for the second polarization.
- the polarization plane of the signal detector of the second power sensor for the second polarization can be arranged in parallel to the second polarization.
- the main radiation vectors of the first power sensor and the second power sensor for the second polarization can be parallel to each other.
- the power sensors for the first polarization can e.g. be arranged in the same fashion as the power sensors for the first polarization. If four power sensors are used—two for each polarization—they can be arranged in a square like fashion when looking onto the power sensors from the front, i.e. from the direction to which the main radiation vectors point at. This arrangement allows defining a two-dimensional monitoring space. Values of the power levels between the power sensors can then be calculated.
- the OTA power sensor can comprise a measurement signal processing unit, which is configured to combine at least two of the measurement signals and output a combined measurement signal.
- the combined measurement signal can e.g. be a combination of measurement signals of a first and a second power sensor.
- Such a combined measurement signal can e.g. provide information about the power levels in the abovementioned monitoring spaces.
- the term combination can be interpreted as any mathematical form of calculating a result based on the two input values.
- the combination can e.g. comprise an addition, a subtraction, a multiplication, a division or any combination thereof.
- the measurement signal processing unit can be configured to calculate and output a mean value of the measurement signals of the first power sensor and the second power sensor in one of the polarizations. Calculating the mean value allows providing an estimate power level at the position in the center between the two power sensors.
- the measurement signal processing unit can be configured to calculate and output a weighted mean value, wherein a weighting factor is predetermined for each one of the measurement signals.
- a weighted mean allows shifting the point in the monitoring space for which the estimate power level is calculated.
- the weighting factor can therefore depend on the shift of the point in the monitoring space with reference to the center of the monitoring space.
- FIG. 1 shows a block diagram of an embodiment of an OTA power sensor according to the present invention
- FIG. 2 shows a block diagram of another embodiment of an OTA power sensor according to the present invention
- FIG. 3 shows a block diagram of another embodiment of an OTA power sensor according to the present invention.
- FIG. 4 shows a flow diagram of an embodiment of a method according to the present invention.
- FIG. 1 shows an OTA power sensor 1 with two first power sensors 3 , 4 .
- the wording first and second power sensors is only used to differentiate the sensors used in the same polarization. I.e. a first and a second power sensor are grouped together because they server to detect signals with the same polarization.
- first and second regarding the power sensors will be omitted. It will be clear from the figures and the respective description that the sensors with parallel polarization planes are a group of a first and a second power sensor.
- the OTA power sensor 1 serves to detect wireless signal 2 , which is emitted by the device under test 100 , which is a 802.11ad conforming device.
- the power sensors 3 , 4 each comprise a respective signal detector 5 , 6 .
- the signal detectors in FIG. 1 are both provided in the form of Vivaldi antennas 5 , 6 .
- the polarization planes 7 , 8 are shown for both Vivaldi Antennas 5 , 6 .
- the Vivaldi antennas 5 , 6 and therefore the polarization planes 7 , 8 of the Vivaldi antennas 5 , 6 are orthogonal to each other, i.e. they are arranged in a 90° angle to each other.
- the main radiation vectors 9 and 8 are however parallel to each other.
- the term main radiation vector in this case refers to the direction of highest sensitivity of the Vivaldi antennas 5 , 6 .
- Every power sensor 3 , 4 comprises a power measurement device 11 , 12 , which is coupled to the respective Vivaldi antenna 5 , 6 and measures the power of the wireless signal 2 as it is received by the respective Vivaldi antenna 5 , 6 .
- the Vivaldi antennas 5 , 6 are coplanar antennas and the radiate and receive signals in the plane in which they extend, i.e. the respective polarization plane 7 , 8 .
- FIG. 1 therefore allows measuring the power of the wireless signal 2 in the two polarization planes 7 , 8 , which are orthogonal to each other.
- FIG. 2 shows a block diagram of another OTA power sensor 20 , which detects wireless signal 21 , which is emitted by the device under test 101 , which also is a 802.11ad conforming device.
- the OTA power sensor 20 comprises three power sensors 22 , 23 , 24 .
- the power sensors 22 , 23 , 24 each comprise a mixer 34 , 35 , 36 , which down-converts the received wireless signal 37 , 38 , 39 to respective frequency reduced measured signals 40 , 41 , 42 .
- the frequency reduced measured signals 40 , 41 , 42 are then provided to the power measurement devices 43 , 44 45 .
- the power sensors 22 and 24 form a group of a first power sensor 22 and a second power sensor 24 , which are both sensitive in the same first polarization.
- the polarization planes 28 , 30 of the power sensors 22 , 24 are parallel to each other, as well as the main radiation vectors 31 , 33 .
- the power sensor 23 is arranged in the space between the power sensors 22 , 24 and is provided orthogonal to the power sensors 22 , 24 .
- the power sensor 23 is therefore sensitive to another second polarization.
- the polarization plane 29 is orthogonal to the polarization planes 28 , 30
- the main radiation vector 32 is parallel to the main radiation vectors 31 , 33 .
- the main radiation vector 32 lies on the plane (not explicitly shown), which is defined by the two main radiation vectors 31 , 33 .
- the arrangement When looking onto the main radiation vectors 31 , 32 , 33 , i.e. in a top-view, the arrangement will look like an H and can therefore be called H-form or H-arrangement.
- FIG. 2 allows measuring the power of the wireless signal 21 e.g. with the power sensor 23 for the second polarization exactly in the main radiation direction of the antenna that emitted the wireless signal 21 . Furthermore, in contrast to the arrangement of FIG. 1 , by providing two power sensors 22 , 24 , the power of the wireless signal 21 for the first polarization can be measured at two positions.
- the main radiation vector lies on the plane (not explicitly shown), which is defined by the two main radiation vectors 31 , 33 .
- calculating the average i.e. the mean value, can also comprise calculating a weighted mean value.
- FIG. 2 therefore allows measuring the exact power levels for two polarizations of the wireless signal 21 in the main radiation direction of the antenna that emits the wireless signal 21 .
- the power sensor 31 , 32 , 33 can comprise or be connected to any device, which is needed to measure, calculate or otherwise determine the wanted power levels.
- FIG. 3 shows an OTA power sensor 50 in a top view, i.e. looking onto the main radiation vectors of the power sensors 51 , 52 , 53 , 54 .
- the power sensors 51 , 53 form a group of a first power sensor 51 and a second power sensor 53 for a first polarization.
- the OTA power sensor 50 further comprises two power sensors 52 , 54 for a second polarization, which is orthogonal to the first polarization.
- the power sensors 51 , 53 and the power sensors 52 , 54 are arranged in a square shape. Therefore, the power sensors 51 , 53 are arranged on opposite sides of the square shape, while the power sensors 52 , 54 are also arranged on opposite sides of the square shape but orthogonally to the power sensors 51 , 53 .
- a measurement signal processing unit 59 is provided in the center of the square arrangement of the power sensors 51 , 52 , 53 , 54 .
- the measurement signal processing unit 59 receives the single measurement signals 55 , 56 , 57 , 58 and calculates for every polarization a mean value. The calculated results are then provided as weighted mean values 60 for further processing.
- FIG. 3 provides more flexibility than the arrangement of FIG. 2 , because by using weighted mean values, the point for which the weighted mean value 60 is calculated can be varied within the area of the square defined by the power sensors 51 , 52 , 53 , 54 .
- the weighting factors for every polarization can e.g. be provided as values between 0 and 1, wherein the sum of the respective two weighting factors must equal 1.
- P is the mean power value
- a is the measured power level of the first power sensor
- b is the measured power level of the second power sensor.
- FIG. 4 shows a flow diagram of a method for over the air, OTA, measuring power of a wireless signal 2 , 20 with at least two different polarizations.
- a first step S 1 the wireless signal 2 , 20 is detected with one single signal detector 5 , 6 , 25 , 26 , 27 in a respective first power sensor 3 , 4 , 22 , 23 , 51 , 52 for every polarization.
- the polarization planes 7 , 8 , 28 - 30 of the signal detectors 5 , 6 , 25 , 26 , 27 are arranged at an angle of more than zero degree to each other and the main radiation vectors 9 , 10 , 31 - 33 of the signal detectors 5 , 6 , 25 , 26 , 27 are parallel to each other.
- step S 2 the power of the detected wireless signal 2 , 20 is measured with one power measurement device 11 , 12 , 43 - 45 in every one of the first power sensors 3 , 4 , 22 , 23 , 51 , 52 .
- respective measurement signals 13 , 14 , 46 - 48 , 55 - 58 are output e.g. for further processing of the measurement results.
- the received wireless signal 37 , 38 , 39 can be down-converted to respective frequency reduced measured signals 40 , 41 , 42 .
- the step S 2 of measuring is then applied to the respective frequency reduced measured signals 40 , 41 , 42 .
- the wireless signal 2 , 21 can be detected with two orthogonal polarizations, wherein the respective first power sensors 3 , 4 , 22 , 23 , 51 , 52 are provided such that the polarization planes 7 , 8 , 28 - 30 of their signal detectors 5 , 6 , 25 , 26 , 27 are orthogonal to each other.
- the measurement signals 13 , 14 , 46 - 48 , 55 - 58 can be combined and a respective combined measurement signal 60 can be provided.
- Combining can e.g. comprise calculating and outputting a mean value, e.g. a weighted mean value, of the measurement signals 13 , 14 , 46 - 48 , 55 - 58 of the first power sensor 3 , 4 , 22 , 23 , 51 , 52 and the second power sensor 24 , 53 , 54 in one of the polarizations.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Description
P=0.5a+0.5b
P=0.7a+0.3b
- 1, 20, 50 over the air power sensor
- 2, 21 wireless signal
- 3, 4, 22, 23, 51, 52 first power sensor
- 5, 6, 25-27 signal detector
- 7, 8, 28-30 polarization planes
- 9, 10, 31-33 main radiation vectors
- 11, 12, 43-45 power measurement device
- 13, 14, 46-48, 55-58 measurement signal
- 34-36 mixer
- 37-39 received wireless signal
- 40-42 frequency reduced measured signals
- 24, 53, 54 second power sensor
- 59 measurement signal processing unit
- 60 weighted mean value
- 100, 101 device under test
- S1-S3 method steps
Claims (20)
Applications Claiming Priority (3)
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EP16176808.0A EP3264641B1 (en) | 2016-06-29 | 2016-06-29 | Over the air power sensor and method |
EP16176808.0 | 2016-06-29 | ||
EP16176808 | 2016-06-29 |
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US20180006736A1 US20180006736A1 (en) | 2018-01-04 |
US10419135B2 true US10419135B2 (en) | 2019-09-17 |
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US11050496B2 (en) | 2018-05-21 | 2021-06-29 | National Instruments Corporation | Over-the-air testing of millimeter wave integrated circuits with integrated antennas |
US10942214B2 (en) | 2018-09-25 | 2021-03-09 | National Instruments Corporation | Hardware timed over-the-air antenna characterization |
US10725080B2 (en) | 2018-09-25 | 2020-07-28 | National Instruments Corporation | Correlation of device-under-test orientations and radio frequency measurements |
CN109378589B (en) * | 2018-11-12 | 2020-08-11 | 北京航空航天大学 | Broadband dual-polarization low-scattering probe and array suitable for near-field plane wave simulator |
US11515950B2 (en) | 2020-09-04 | 2022-11-29 | National Instruments Corporation | Over-the-air testing of millimeter wave antenna arrays |
EP4024058B1 (en) * | 2021-01-05 | 2024-07-10 | Rohde & Schwarz GmbH & Co. KG | Over-the-air test module and test system |
US11982699B2 (en) | 2021-11-22 | 2024-05-14 | National Instruments Corporation | Over-the-air testing of millimeter wave antenna receiver arrays |
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2017
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- 2017-04-28 CN CN201710297361.0A patent/CN107547152B/en active Active
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EP3264641A1 (en) | 2018-01-03 |
CN107547152B (en) | 2022-03-29 |
US20180006736A1 (en) | 2018-01-04 |
EP3264641B1 (en) | 2020-01-08 |
CN107547152A (en) | 2018-01-05 |
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